Question

In corn, seeds may be starchy (S) or sweet (s). Cross two heterozygous starchy corn plants. Using a Punnett’s square, give the phenotypic ratio then state the proportion of offspring that would be expected to be sweet?

Answer 1

if we cross Ss with Ss on the punnet square we will get the gametes S and s for both parents

on top left we have SS since we combine the alleles S and S

on top right we have Ss since we combine the alleles S and s

on bottom left we have Ss since we combine the alleles S and s

on bottom right we have ss since we combine the alleles s and s

The phenotypic ratio starchy:sweet is 3:1

1:3 of the offspring will be sweet